Convert Fahrenheit to Celsius instantly, perfect for checking body temperature and weather readings.
Explore Fahrenheit & Celsius scale differences, clinical medical fever thresholds, recipe baking scales, and rapid mental math estimation tricks.
Essential benchmarks for weather, clinical body temperature, and cooking.
To quickly estimate Fahrenheit to Celsius in your head:
Subtract 30 from the Fahrenheit number, then divide by 2.
Example for 70°F: Subtract 30 = 40 → Divide by 2 = 20°C (Exact value is 21.1°C!).
Celsius is calculated by subtracting 32 from the Fahrenheit value and then dividing the result by 1.8 (or 9/5), written as C = (F - 32) / 1.8. Reversing the formula to solve for Fahrenheit gives F = (C x 1.8) + 32, which is how the companion Celsius to Fahrenheit Converter works.
The Fahrenheit scale sets water's freezing point at 32 degrees rather than 0, so that offset has to be removed before the two scales can be compared on the same footing. Once the 32 degree baseline is subtracted, dividing by 1.8 rescales the remaining 180 Fahrenheit degrees down to the 100 Celsius degrees that span freezing to boiling.
Convert a 350 degree Fahrenheit oven setting by subtracting 32 to get 318, then dividing 318 by 1.8 for a result of about 176.7 degrees Celsius, commonly rounded to 175C or 180C on European ovens. A quick mental check is 98.6F, which converts to exactly 37.0C, the standard healthy body temperature.
This tool helps travelers read local weather reports, cooks adjust American recipes for metric ovens, and anyone checking a Fahrenheit thermometer reading against Celsius fever thresholds. Use the Celsius to Fahrenheit Converter for the reverse direction, or the Length Converter and Weight Converter for other everyday unit conversions.
Quick answers about how this tool works.
Plain-language explainers that sit next to this tool.
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